Develop a simple mobile application (please help)

[petarPan]

Hi team! I am a new user of the Power Apps platform and I would need basic guidelines to complete the app (not sure how to get started as there are plenty of learning paths and modules). The first problem I encountered was how to send a REST POST request with data obtained from data form (user input).

Requirements:
Develop a mobile app (use Power Apps) with the following functionality:
- Take a photo. User takes a photo-selfie or selects it form the photo library
- Call ML API. Use Azure ML to predict the age and gender of the person form the image
- Call third-party API. Once you have the data, get a Quote from third-party (over API) for a insurance product
- Provide an insurance Offer. Display the Quote to the user as an offer
- Generate mobile (iphone/android) app
- Publish locally within the software (not in the AppStore)

So my application would be based on REST POST calls (dynamic data) using JSON (first to recognize face, the second call for authentication - oauth 2.0, the third to create a quote with dynamic data - user input through the form).

I am attaching screenshots to be clearer. Thank you!